Sierra 18-8220 Fuse Kit 90 Amp - Replaces Mercruiser 88-79023A91, Mallory 9-15510, for 470 Series Alternator Conversion

The Sierra 18-8220 Fuse Kit is a 90 amp fuse assembly designed for use with the alternator conversion system on Mercruiser 470 Series aluminum block engines built with a stator charging system and water cooled voltage regulator to the alternator. This fuse kit protects the charging circuit and is required on engines equipped with a Delco starter, identifiable by the round solenoid mounted directly to the starter. Engines fitted with a Prestolite starter using a remote solenoid do not require this fuse kit, so it is important to visually inspect the starter before ordering.

Sierra manufactures the 18-8220 to meet or exceed original equipment quality and specifications, giving boat owners a reliable replacement or upgrade option when servicing the charging system on covered Mercruiser engines. The kit carries a 90 amp current rating at 12 volts and is finished in white. It is sold separately from the alternator conversion kit itself and is compact, with each unit measuring approximately 0.39 x 0.39 x 0.39 inches and weighing 0.13 pounds.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8220
• Product Type: Fuse Kit
• Current Rating: 90 Amps
• Voltage: 12 Volts
• Color: White
• Mounting Type: Surface Mount
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.13 pounds
• OEM Cross Reference: Mallory 9-15510, Mercruiser 88-79023A91

Fitment

• Mercruiser 470 Series aluminum block engines, serial number 4625580 and up, with stator charging system and water cooled voltage regulator to alternator system
• Mercruiser 224 / 3.7L
• Required on engines with a Delco starter (round solenoid mounted to starter); not required on Prestolite starters with remote solenoid

Replaces (OEM)

• Mallory 9-15510
• Mercruiser 88-79023A91

Frequently Asked Questions

What engines does the Sierra 18-8220 fuse kit fit? The 18-8220 fits Mercruiser 470 Series aluminum block engines, serial number 4625580 and up, that use a stator charging system with a water cooled voltage regulator to the alternator, including the Mercruiser 224 / 3.7L.

Is this fuse kit required for every 470 Series alternator conversion? No. The Sierra 18-8220 fuse kit is only required on engines with a Delco starter, which has a round solenoid mounted directly to the starter. Engines with a Prestolite starter using a remote solenoid do not require it, so inspect the starter before ordering.

What is the current rating of the 18-8220 fuse kit? The Sierra 18-8220 is rated for 90 amps at 12 volts.

What OEM or aftermarket parts does the 18-8220 cross-reference with? The 18-8220 is interchangeable with Mallory 9-15510 and Mercruiser 88-79023A91.

Does the 18-8220 fuse kit include the alternator bracket or conversion kit? No. The 18-8220 fuse kit is sold separately from the 470 Series alternator conversion kit and covers only the fuse assembly, not the bracket or drive belt used in that kit.

How much does the Sierra 18-8220 fuse kit weigh? It weighs 0.13 pounds.

What color is the 18-8220 fuse kit? It is white.

What are the dimensions of the 18-8220 fuse kit? The unit measures approximately 0.39 x 0.39 x 0.39 inches.

Is the Sierra 18-8220 an OEM-quality replacement? Yes, Sierra manufactures the 18-8220 to meet or exceed the original equipment part it replaces, including the Mercruiser 88-79023A91.

How do I know if my engine needs the 18-8220 fuse kit? Check the starter on your Mercruiser 470 Series engine: a round solenoid mounted to the starter (Delco starter) means the 18-8220 fuse kit is required, while a remote solenoid (Prestolite starter) means it is not needed.